<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc,index) in starClasses" :key="index" :class="sc"></span>
    </div>
</template>

<script>
// 类名常量
const CLASS_ON = 'on'
const CLASS_HALF = 'half'
const CLASS_OFF = 'off' 
export default {
    props:{
        score:Number,
        size:Number
    },
    // 计算属性（根据评分来判断这个类）
    computed: {
        starClasses(){
            const {score} = this
            const scs = []
          //   // 向scs中添加n个‘on’,
            const scoreInteger = Math.floor(score);
            for(let i =0 ;i< scoreInteger;i++){
               scs.push(CLASS_ON)
            }
          //  添加一个‘half’
           if(score*10-scoreInteger*10>=5){
              scs.push(CLASS_HALF)
           }
          // 添加n个off
         
          while(scs.length<5){
             scs.push(CLASS_OFF)
          }
            return scs 
        }
    },
}
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .star //2x图 3x图
    float left
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('./images/star48_on')
        &.half
          bg-image('./images/star48_half')
        &.off
          bg-image('./images/star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star36_on')
        &.half
          bg-image('./images/star36_half')
        &.off
          bg-image('./images/star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star24_on')
        &.half
          bg-image('./images/star24_half')
        &.off
          bg-image('./images/star24_off')
</style>

